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Search Results: 1 - 10 of 60976 matches for " Ant?nio Marciano da; "
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O efeito da época de irriga??o e de parcelamentos de aduba??o sobre a produtividade do cafeeiro em três safras consecutivas
Coelho, Gilberto;Silva, Antnio Marciano da;
Ciência e Agrotecnologia , 2005, DOI: 10.1590/S1413-70542005000200018
Abstract: the positive effects of irrigation on coffee crop productivity are reported in several scientific works. however, it is necessary to investigate the irrigation effect on coffee plant behavior, in consecutive harvests. therefore, the present study purposes to evaluate the irrigation seasons and splitting fertilizer effects on coffee plant biennial productivity cycle. an experiment was carried out in split plots, testing different fertilizer numbers applications: plot 1 (p1) has received 12 manual fertilizers applications; plots 2, 3 and 4 (p2, p3 and p4) have received, respectively, 12, 24 and 36 fertilizers applications by irrigation water. in subplots, 3 irrigations seasons were tested, working with 3 replications (blocks): 01/jun to 30/set (subplot a), 15/jul to 30/set (subplot b), 01/set to 30/set (subplot c) and a treatment for testifying without irrigation (subplot d). cloth and ground coffee productivity and total productivity, in kg ha-1, were evaluated by anova and mean tests. significant effects of fertilizer applications, on cloth coffee productivity, were verified by anova, with p1 split plot has provided the best productivity (3120 kg ha-1). irrigation seasons have showed significant effects on three parameters studied. significant statistical interaction was verified only among crops and irrigation seasons. those results demonstrate that irrigation does not have eliminated the coffee plant biennial productivity cycle. it is recommended to start irrigation from 01/jun, because this treatment has produced better results than others, in two of the three crops studied, besides the smallest coefficient of variation concerning productivity.
CONTRIBUI O DE SAFRINHAS EM SUCESS O à CULTURA DA SOJA EM PLANTIO DIRETO SOBRE A RESISTêNCIA à PENETRA O DO SOLO EFFECTS OF DOUBLE CROPPING WITH SOYBEAN ON SOIL PENETRATION RESISTANCE UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i1.2527
Abstract: Objetivou-se avaliar a resistência à penetra o do solo em área com sete sucess es de culturas, envolvendo as seguintes culturas de safrinhas: milho, soja, milheto, girassol, sorgo, aveia e nabo forrageiro, com a cultura da soja, no sistema plantio direto, conduzidas durante três anos (1994-1996), na área experimental da Funda o de Ensino Superior de Rio Verde, no município de Rio Verde, Goiás. No último ano, na entressafra de culturas de safrinha e cultura de ver o mediu-se a resistência à penetra o no solo em diferentes camadas entre 0 e 30 cm de profundidade, utilizando-se penetrógrafo. Observou-se intera o significativa entre sucess es de culturas e profundidades no perfil do solos para a característica avaliada. As sucess es que incluem milheto e sorgo reduzem a resistência à penetra o do solo a 15 cm de profundidade, comparadas ao girassol. Nesta profundidade o solo ofereceu tendência à maior resistência à penetra o em todos os tratamentos avaliados. PALAVRAS-CHAVE: Física do solo; solos de cerrado; penetrometria. The objective of this study was objectified to evaluate the resistance to the penetration of the soil in area as seven successions of cultures, involving the double cropping cultures: corn, soybean, pearl millet, sunflower, sorghum, oat and turnip fodder, with the culture of the soybean, in no-tillage, driven for three years (1994-1996), in the Foundation experimental area of Higher education de Rio Verde, in the municipal district of Rio Verde, Goiás. In the last year, in the between cultures of double cropping it measured the resistance to the penetration in the soil in different layers between 0 and 30 depth cm, using penetrographer. Significant interaction was observed between successions of cultures and depths in the profile of the soils for the appraised characteristic. The successions that include pearl millet and sorghum reduce the penetration of the soil to 15 cm of depth bought to the sunflower. In this depth the soil offered tendency the largest resistance to the penetration in all the appraised treatments. KEY-WORDS: Physics of the soil; soil in the cerrado; metropenetrography.
INFLUêNCIA DE SUCESS O DE CULTURAS SOBRE CARACTERíSTICAS AGRON MICAS DO MILHO (Zea mays L.) EM PLANTIO DIRETO INFLUENCE OF CROP SEQUENCES ON AGRONOMIC CHARACTERISTICS OF CORN (Zea mays L.) UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i1.2530
Abstract: Avaliaram-se características agron micas na cultura do milho em seis sucess es de culturas (milho-milho, soja-milho,girassol-milho, milheto-milho, sorgo-milho e guandu milho) em plantio direto, durante três anos, em Rio Verde, Goiás. Observou-se significancia, pelo teste F, para altura de planta, peso de 100 gr os e umidade dos gr os na colheita. Guandu, soja, girassol e milheto proporcionaram maior altura da planta de milho. N o foram observadas diferen as estatísticas entre as sucess es para produtividades de gr os e demais características avaliadas. PALAVRAS-CHAVE: Sucess o de culturas; milho; características agron micas. Evoluated agronomic characteristics of corn in six crop sequences (corn-corn, soybean-corn, sunflower-corn, pearl milletcorn, sorghum-corn and pigeon pea-corn) under no-tillage for three years, in Rio Verde, Goiás State. Significance was observed by the test F for plant height, 100 grain weight and grain moisture. Pigeon pea, soybean, sunflower and pearl millet, resulted in taller corn plants. No statistical differences were found between crop sequences for corn grain yield and other characteristics. KEY-WORDS: Crop sequences; corn; agronomic characteristics.
INFLUêNCIA DE CULTURAS DE SAFRINHAS EM SUCESS O à CULTURA DO MILHO (Zea mays L.) NO SISTEMA PLANTIO DIRETO SOBRE A RESISTêNCIA à PENETRA O DO SOLO INFLUENCE OF DOUBLE CROPPING IN SUCESSION TO THE CULTURE OF THE CORN (Zea mays L.) IN THE NO TILLAGE ON THE RESISTANCE TO THE PENETRATION OF THE SOIL
Antnio Pasqualetto,Liovando Marciano da Costa,Antnio Alberto da Silva,Carlos Sigueyuki Sediyama
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v29i2.2837
Abstract: O objetivo desse trabalho foi avaliar a resistência à penetra o do solo em área com seis sucess es de culturas, envolvendo safrinhas com a cultura do milho, no sistema plantio direto, conduzidas durante três anos, em Rio Verde, Goiás. O experimento foi conduzido no ano de 1995. As culturas de safrinha utilizadas foram; milho (Zea mays L.), soja (Glycine max L.), girassol (Helianthus annus L.), milheto (Pennisetum typhoides), sorgo (Sorghum vulgare Pers) e guandu (Cajanus indicus Spreng). A sucess o de cada safrinha com a cultura do milho constituiu os tratamentos, num total de seis, que compunham as parcelas, dispostos em glebas independentes, enquanto as profundidades no solo de 7,5, 15,0, 22,5 e 30,0cm constituíram as subparcelas. Observou-se uma intera o significativa entre sucess es de culturas e profundidades no perfil do solos para a característica de resistência à penetra o da haste do penetrógrafo. N o foram observadas diferen as estatísticas entre as sucess es. Quanto à profundidade aos 30,0 cm, houve uma redu o significativa da resistência à penetra o do solo, sendo mais evidente quando sorgo e milheto foram cultivados como culturas de safrinha. PALAVRAS-CHAVE: Física do solo; solos do cerrado; penetrometria. The objective of this paper is to evaluate the resistance to soil penetration in an area with six successions of cultures, involving the double cropping cultures and corn, in no-tillage management, carried out for three years in Rio Verde, Goiás. The experiment was conducted in 1995. The used double croppings were: corn (Zea mays L.), soy (Glycine max L.), sunflower (Helianthus annus L.), pearl millet (Pennisetum typhoides), sorghum (Sorghum vulgare Pers) and guandu (Cajanus indicus Spreng). The succession of each double cropping with the culture of corn constituted the treatments, in a total of six, which composed the portions, disposed in independent gleeful, while the depths in the soil of 7,5, 15,0, 22,5 and 30,0 cm constituted the sub-portions. A significant interaction was observed between successions of cultures and depths in the profile of the soils. Statistical differences were not observed. As far as depth to 30 cm is concerned, there was a significant reduction of the resistance to the penetration of soil, even more evident when sorghum and pearl millet were cultivated as double cropping cultures. KEY-WORDS: Physics of the soil; soils of cerrado; peng.
OCORRêNCIA DE PLANTAS DANINHAS NA CULTURA DO MILHO (Zea mays L.) EM SUCESS O A CULTURAS DE SAFRINHA NO SISTEMA PLANTIO DIRETO WEEDS IN THE DOUBLE CROPPING WITH CORN (Zea mays L.) UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa,Antnio Alberto da Silva,Carlos Sigueyuki Sediyama
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i2.2480
Abstract: Objetivou-se avaliar a ocorrência de espécies daninhas na cultura do milho após diversas culturas de safrinha, no sistema plantio direto. As culturas de safrinha foram milho, soja, milheto, girassol, sorgo, aveia e guandu. As plantas daninhas foram avaliadas aos 30 dias após a semeadura, por meio de amostragens ao acaso na parcela, utilizando um quadro de 0,45 m2 (1,5 m x 0,3 m), colocado perpendicularmente às linhas de semeadura e recolhendo-se todo o material verde de plantas daninhas existentes na amostra, classificando-o por espécie vegetal, agrupando as principais monocotiled neas, principais dicotiled neas e outras plantas daninhas. Os resultados demonstraram maior ocorrência das espécies Digitaria horizontalis e Commelina benghalensis na cultura do milho, independentemente da sucess o estabelecida. C. benghalensis predominou na sucess o milho-milho, e D. horizontalis na sucess o soja-milho. A menor infesta o de plantas daninhas foi observada na área em que a cultura do girassol antecede a cultura do milho. Utilizando-se o milheto como cultura de safrinha, há maior ocorrência de espécies dicotiled neas na cultura do milho, especialmente a Euphorbia heterophylla. PALAVRAS-CHAVE: Sucess es de culturas; milho; plantas daninhas. It was observed to evaluate the occurrence of the weeds, after 3 years of cultivation with successions of double cropping cultures with the culture of the corn. The double cropping cultures were: corn, soybean, pearl millet, sunflower, sorghum, oat and pigeon pea. The weeds were appraised to the 30 days after the sowing, by means of sampling to the maybe in the portion, using a icture of 0.45 m2 (1.5 m x 0.3 m), placed in a perpendicular way to the plantation lines and being picked up the whole material existent green of weeds in the sample, classifying in for vegetable species, containing the main monocotiledonous, main mocotiledoneous and other weeds. The results demonstrated that there was larger frequency of the species there would Digitaria horizontalis and Commelina benghalensis, the first in the succession corn-corn and second in the succession soybean-corn. The smaller concentration of weeds happened in the succession sunflowercorn. The smallest occurrence of the weeds was observed in the area in that the culture of the sunflower precedes the culture of the corn. Being used the pearl millet in double cropping culture, there is bigger occurrence of species dicotiledoneous in the culture of the corn, especially Euphorbia heterophylla. KEY-WORDS: Successions of cultures; corn; weeds.
Qualidade da água do Ribeir?o Lavrinha na regi?o Alto Rio Grande - MG, Brasil
Pinto, Daniel Brasil Ferreira;Silva, Antnio Marciano da;Mello, Carlos Rogério de;Coelho, Gilberto;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000400028
Abstract: the main purpose of this work was to study the surface water quality behavior, continuously throughout the time, at the headwater watershed of the grande river, mg. the watershed drains into grande river area of 687 ha and is enclosed by the mantiqueira mountains. the samples were collected at six points in lavrinha stream, main tributary of the watershed, from may 2006 to january 2007, with a total of seven evaluations for each point. current watershed land use map was developed through gps device, based on field observations. the parameters evaluated were: hydrogen potential (ph), dissolved oxygen (do), electric conductivity (ec), salinity, temperature, biochemical oxygen demand (bod), chemical oxygen demand (cod), nitrate (no3-), ammonia (nh3), phosphorous (po4), turbidly, total soil, total dissolved soil (tds), fecal coliform (escherichia coli), total coliform. water quality index (wqi), proposed by "minas gerais state water resources institute" (igam), was calculated for all samples, classifying the water quality class according to conama resolution 357/05. the environmental conditions reflected on wqi values as well as on conama water quality classification. it was evidenced that the main parameter of the critical situation of the water quality at watershed was the fecal and total coliform, which is associated to livestock. although less important than coliform, do and bod are also limiting parameters at watershed.
Simula??o da variabilidade espacial da eros?o hídrica em uma sub-bacia hidrográfica de Latossolos no sul de Minas Gerais
Silva, Antnio Marciano da;Mello, Carlos Rogério de;Curi, Nilton;Oliveira, Polyanna Mara de;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000500033
Abstract: simulation of water erosion spatial distribution is an important tool for soil conservation planning in watersheds, being an important application of the universal soil loss equation (usle) using interpolation principles, such as geostatistics. this study aimed to simulate spatial distribution of water erosion in a watershed of the alto rio grande (mg) region, applying geostatistical tools for mapping, considering different land use scenarios. water erosion was estimated by the usle applied to grid cells, weighing pedologic units and land use distribution in each cell. the topographical factor (ls) of the cells was obtained based on a digital elevation model of the sub-watershed, identifying length and main flow direction. mean annual rainfall erosivity in the region is 8,030 mj mm ha-1 h-1 year-1 and the underlying soil erodibility values were based on data from the literature. mapping was carried out considering the current land uses in the entire watershed, where eucalyptus was grown on degraded soils, grasses planted as pasture and corn tilled conventionally. under the current land uses, soil losses from the watershed were not relevant, except in areas covered with eucalyptus and grass on cambisol (inceptisol). in all simulations, the highest soil losses were verified on the eastern side of the watershed, especially for eucalyptus and conventional corn on cambisol and dystrophic red-yellow latosol (oxisol), where special soil conservation techniques are needed.
Aplicabilidade do lisem (limburg soil erosion) para simula??o hidrológica em uma bacia hidrográfica tropical
Gomes, Natalino Martins;Mello, Carlos Rogério de;Silva, Antnio Marciano da;Beskow, Samuel;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000600025
Abstract: the most important parameters of the lisem model associated to surface runoff production (antecedent soil moisture (θap) and soil layer thickness), were calibrated by individual precipitation events in the marcela creek watershed, alto rio grande region, mg. the hydrological effects of different land-uses in the watershed were also simulated. the model was highly sensitivity to soil moisture, which was the most important calibration paramete. the influence of the water balance layer was related to the soil moisture during calibration. it was observed that the deeper the soil layer, the greater the soil moisture required to calibrate the model. results of simulation showed that the peak discharges were reduced under native forest, eucalyptus plantation and 35 months-old coffee plantation, respectively, by 37.6; 42.2 and 28.0 %, in the case of a precipitation event of 48 mm h-1. the results of the hydrological model lisem in hydrological simulations of direct surface runoff were satisfactory, suggesting that it may be used for hydrological behavior prediction in tropical watersheds after adequately calibrated.
Estabilidade temporal do conteúdo de água em três condi??es de uso do solo, em uma bacia hidrográfica da regi?o da Serra da Mantiqueira, MG
ávila, Léo Fernandes;Mello, Carlos Rogério de;Silva, Antnio Marciano da;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000600024
Abstract: the description of soil hydrological processes is relatively complex, especially in the case of moisture, which is influenced by edaphic, topographic, climatic and vegetation factors. under field conditions, an adequate sampling strategy is required to estimate soil moisture, considering variations in time and space. to represent the soil moisture adequately with less sampling effort and cost, the concept of temporal stability has often been applied. this study was carried out with the objective of analyzing the temporal stability of the surface soil moisture (0-0.20 m layer) under three land uses in an experimental area in a catchment of the mantiqueira range region, state of minas gerais, brazil, in the dry and rainy seasons, identifying the most representative points for monitoring. greatest temporal stability was observed in the wetland, less under atlantic forest and intermediate in a pasture area. significant variation was also observed in the mean relative difference between the sampling periods, indicating that the characteristics of each site should be particularly considered to choose the points. in the pasture area, only one point could be identified to monitor both periods (rainy and dry). on the other hand, in the atlantic forest and wetland areas two points were identified, one specifically for the rainy and the other for the dry season; so an individual analysis for each season is recommended.
Avalia??o do efeito do parcelamento da aduba??o e da época de início da irriga??o sobre a produtividade do cafeeiro
Silva, Antnio Marciano da;Sorice, Leonardo S. D.;Coelho, Gilberto;Faria, Manoel Alves de;Rezende, Fátima C. De;
Ciência e Agrotecnologia , 2003, DOI: 10.1590/S1413-70542003000600021
Abstract: the effect of starting the irrigation season at different dates and the effect of multiple fertilizer applications, through fertigation and traditional fertilizer hand spreading, were evaluated in an experiment conducted in a 12 years old 'catuaí' coffee orchard, with plants in a 3.5 by 0.8 m spacing, located at the múquem farm - faepe/ufla in lavras, mg. an experimental design with 3 completely randomized blocks was used. each block was split in 4 randomized portions submitted to four different fertilization treatments: fertigation with three different numbers of multiple applications (p4 = 36; p3 = 24; p2 = 12) and multiple (p1=12) fertilizer applications by hand spread. each one of the plots corresponding to a fertilization treatment was subdivided, without randomization, in 4 subplots: a non irrigated control (d) treatment receiving an even 4way fertilizer split application and three irrigated subplots with the irrigation season starting at different dates (a =06/01; b = 07/15; c = 09/01 and d correspond to the). crop yield (97/98 harvest season) was analyzed considering the amount of coffee picked by harvest manual in the cloth, coffee picked in the ground and the sum of both methods. measured weight values were submitted to variance analysis and test of averages. the analysis of variance showed a significant effect of irrigation timing over all parameters, the amount of coffee picked in the ground was affected by fertigation, interaction between irrigation and fertilization split affected coffee picked by harvest manual in the cloth the total amount of picked coffee. the test of averages showed that the a parcel (irrigated starting in 06/01) presented the best yield results, 56.6 bags/ha of coffee picked by harvest manual in the cloth and a total of 67.7 bags/ha, that represents a 73% increase on coffee picked by harvest manual in the cloth and a 68,4% increase in the total coffee picked in relation to the non irrigated control treatment. considering the inter
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